Grokcore.catalog

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- Nothing changed yet.

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- Add support for Python 3.7, 3.8, 3.9, 3.10, 3.11.

- Drop support for Python 2.7, 3.4, 3.5, 3.6.

- Fix tests to be able to run with ``zope.component >= 5``.

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- Rearrange tests such that Travis CI can pick up all functional tests too.

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- Python 3 compatibility.

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- Introduce IntId index that is more optimized to index values by their int ids.

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- Update tests.